<?php

    /**
     * PHPExcel_Shared_Escher_DgContainer_SpgrContainer
     * Copyright (c) 2006 - 2015 PHPExcel
     * This library is free software; you can redistribute it and/or
     * modify it under the terms of the GNU Lesser General Public
     * License as published by the Free Software Foundation; either
     * version 2.1 of the License, or (at your option) any later version.
     * This library is distributed in the hope that it will be useful,
     * but WITHOUT ANY WARRANTY; without even the implied warranty of
     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     * Lesser General Public License for more details.
     * You should have received a copy of the GNU Lesser General Public
     * License along with this library; if not, write to the Free Software
     * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
     * @category   PHPExcel
     * @package    PHPExcel_Shared_Escher
     * @copyright  Copyright (c) 2006 - 2015 PHPExcel (http://www.codeplex.com/PHPExcel)
     * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt    LGPL
     * @version    ##VERSION##, ##DATE##
     */
    class PHPExcel_Shared_Escher_DgContainer_SpgrContainer {
        /**
         * Parent Shape Group Container
         * @var PHPExcel_Shared_Escher_DgContainer_SpgrContainer
         */
        private $parent;
        /**
         * Shape Container collection
         * @var array
         */
        private $children = [];

        /**
         * Get the parent Shape Group Container if any
         * @return PHPExcel_Shared_Escher_DgContainer_SpgrContainer|null
         */
        public function getParent() {
            return $this->parent;
        }

        /**
         * Set parent Shape Group Container
         * @param PHPExcel_Shared_Escher_DgContainer_SpgrContainer $parent
         */
        public function setParent($parent) {
            $this->parent = $parent;
        }

        /**
         * Add a child. This will be either spgrContainer or spContainer
         * @param mixed $child
         */
        public function addChild($child) {
            $this->children[] = $child;
            $child->setParent($this);
        }

        /**
         * Get collection of Shape Containers
         */
        public function getChildren() {
            return $this->children;
        }

        /**
         * Recursively get all spContainers within this spgrContainer
         * @return PHPExcel_Shared_Escher_DgContainer_SpgrContainer_SpContainer[]
         */
        public function getAllSpContainers() {
            $allSpContainers = [];
            foreach ($this->children as $child) {
                if ($child instanceof PHPExcel_Shared_Escher_DgContainer_SpgrContainer) {
                    $allSpContainers = array_merge($allSpContainers, $child->getAllSpContainers());
                } else {
                    $allSpContainers[] = $child;
                }
            }
            return $allSpContainers;
        }
    }
